How can I skip a piece of code in recursion?

def bin_to_decimal(inp, degree=0, result=0):
arr = []
for i in inp:
    arr.append(i)
if not arr:
    return result
else:
    x = arr.pop(-1)
    result += int(x)**degree
    return bin_to_decimal(inp, degree+1, result)


bin_to_decimal('1001')

Is it possible to skip this part of function, when I call recursion?

arr = []
for i in inp:
    arr.append(i)

>Solution :

You can use:

def bin_to_decimal(inp, degree=0, result=0, skip=False):
    if skip:
        arr = []
        for i in inp:
            arr.append(i)
    if not arr:
        return result
    else:
        x = arr.pop(-1)
        result += int(x)**degree
        # Flag True to skip
        return bin_to_decimal(inp, degree+1, result, True)

But you will now have an unreferenced variable arr

• along with a few more errors

I suggest you have a look at some other methods that you can use:

Built-in:

>>> int('1001',2)
9

Iteration:

def bin_to_decimal(inp):
    x = 0
    for i in inp:
        x = x*2 + int(i)
    return x